急性胰腺炎病人,为减轻疼痛,可协助其采取的卧位是
A. 去枕平卧
B. 俯卧
C. 屈膝侧卧
D. 头低脚高
E. 半坐卧位
上消化道出血后内镜检查的最佳时间是
A. 24h内
B. 24~48h
C. 48~72h
D. 3~5d
E. 5~7d
肝硬化病人出现全血细胞减少,最主要的原因是
A. 功能性肾衰竭
B. 营养吸收障碍
C. 叶酸缺乏
D. 脾功能亢进
E. 凝血因子合成减少
The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and
A. reciprocating motion of exhaust valves
B. rotary motion of the camshaft
C. reciprocating motion of the piston
D. developed differential